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Exhaust gas purification system of working machine

  • US 8,844,273 B2
  • Filed: 04/28/2011
  • Issued: 09/30/2014
  • Est. Priority Date: 05/07/2010
  • Status: Expired due to Fees
First Claim
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1. An exhaust gas purification system of a working machine having an engine mounted to the working machine, comprising:

  • an exhaust system of the engine outputting exhaust gas;

    an exhaust gas purification device comprising a catalyst and a soot filter, the exhaust gas purification device being configured to be mounted to the engine and being coupled to the exhaust system of the engine so as to receive the exhaust gas;

    an intake air throttle that determines an amount of air to be input to the engine;

    an exhaust gas throttle that determines an amount of exhaust gas to be input to the exhaust gas purification device;

    a controller that determines a clogged state of the soot filter, that controls the intake air throttle, that controls the exhaust gas throttle, and that has a renewing mode during which either one or both of the air intake throttle and exhaust gas throttle are controlled in a manner that increases temperature of the exhaust gas to a degree allowing particulate matter clogging the soot filter to be burned in the soot filter and exhausted from the exhaust gas purification device,a rotating speed holding switch having a first switch state in which an input is provided to the controller indicating that the controller is to hold a rotating speed of the engine and inhibit said renewing mode, even when the controller is already in said renewing mode.

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